This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
. Its location and extent varied over time but usually reached broader west as on the map here The original map was not copyrighted by SU although was secret The maps are hold by sunsite berkeley edu without any permit ions of originator Anyway the SU do not exist and usually materials created by government agencies are not copyrighted